For a conference, each guest is given a complementary sample of a new fruit drink to try. The staff for the conference has been instructed to fill the glass 3/4 full. The glass are right circular cylinders and have the interior dimensions shown in the figure. There are 220 guests expected at the conference. If the fruit drink comes in 0.5 liter bottles, how many bottles will be needed so that the staff at the conference will have enough to serve each expected guest a glass that is 3/4 full? (1 cubic centimeter is equivalent to 0.001 liter)